GE 994-0089 User Manual
GE
Energy
D400 Substation Data Manager User's Manual
49
4.4 RS-485
Connections
The D400 accepts connections to RS-485 2-wire and 4-wire type devices through the RS-
485 Adapter. The RS-485 Adapter (GE Part No. 520-0208) plugs into any serial
communication slot (slots 1 through 8) on the D400. It contains two independently
isolated RS-485 channels on a single terminal block: Channel 1 on terminals TB1-1
through TB1-5 and Channel 2 on terminals TB1-6 through TB1-10.
See section “3.4 RS-485 Adapter” for configuration options.
485 Adapter. The RS-485 Adapter (GE Part No. 520-0208) plugs into any serial
communication slot (slots 1 through 8) on the D400. It contains two independently
isolated RS-485 channels on a single terminal block: Channel 1 on terminals TB1-1
through TB1-5 and Channel 2 on terminals TB1-6 through TB1-10.
See section “3.4 RS-485 Adapter” for configuration options.
Cabling Requirements
The recommended total maximum length for RS-485 cables is 4000 ft [1300 m] when
operating at 115 kbps. Refer to the manual of the connecting device for its recommended
maximum cable length.
The cables must be shielded and the shield of each RS-485 cable section should be
grounded at one end only. This prevents circulating currents and can reduce surge-
induced current on long communication lines.
operating at 115 kbps. Refer to the manual of the connecting device for its recommended
maximum cable length.
The cables must be shielded and the shield of each RS-485 cable section should be
grounded at one end only. This prevents circulating currents and can reduce surge-
induced current on long communication lines.
2-Wire Connections
»
To connect RS-485 2-wire type devices to the RS-485 Adapter, use the
following wiring connection:
Note: Before wiring devices, ensure that the RS-485 Adapter is configured to 2-wire
mode (see section “3.4 RS-485 Adapter”).
mode (see section “3.4 RS-485 Adapter”).
Relay
RS485+
RS485-